Piper Aircraft Corporation Cherokee 140 PA-28-140, Service Manual

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PIPER CHEROKEE SERVICE MANUAL
01/31/08 VI - HYDRAULIC SYSTEM
2E3
2. Gear Up: Set maximum climb power. Maintain approximately 70 MPH (61 Kts) for
approximately 15 seconds. Move the gear selector up. The gear should stay down and locked.
Increase the airspeed at the rate of 1 MPH (1 Kt) per second. The gear should begin to retract
between 80 and 90 MPH (70 and 78 Kts) at zero density altitude. The speed at which the gear
starts up will increase 1.5 MPH (1.3 Kts) for each 1000' increase of density altitude.
3. Manual Override Up Latch: With the gear up, the aircraft in normal flight configuration, select
up on the gear override lever. Engage the up latch. The amber up latch warning light, below the
gear selector switch, should be flashing. Gradually slow the aircraft below the auto gear extend
speed and observe that the gear stays fully retracted. Disengage the up latch. The flashing
amber warning light should stay out.
e. Gear Indicator Lights:
1. The green lights indicate when the corresponding gear is in the down and locked position. Turn
landing light switch on and off - observe ammeter for indication.
2. The amber light indicates when the gear is in an intermediate position, neither fully up nor
down.
3. The Red gear warning light will indicate an unsafe condition. It will indicate when the throttle
setting is less than 14 ± 2 inches of manifold pressure while the gear is not down and locked. It
will also indicate when the gear is down and locked while the selector is in the UP position,
except at full throttle.
f. The Gear Warning Horn: It will sound whenever the red gear warning light is on.
g. Micro Switch Check:
1. The forward throttle micro switch is checked by moving the throttle full forward while the gear
is down and the gear selector switch is in the up position. The horn should stop sounding and
the red light should go out. Retard the throttle slightly and the horn and light should come on.
2. The aft throttle micro switch setting is checked as follows: with the gear up, reduce the throttle
at a normal rate. The gear warning horn and the red light should come on at 14 inches of
manifold pressure ± 2 inches.
6-17. NOSE GEAR ACTUATING CYLINDER.
6-18. REMOVAL.
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Disconnect the hydraulic lines from the actuating cylinder and cover the open line ends to prevent
contamination.
c. Disconnect the cylinder operating rod end from the downlock hook by removing attachment nut and
bolt.
d. Disconnect the cylinder from its attachment fitting by removing nut and bolt.
e. Remove the cylinder from the wheel well.